Roof rack crossbar



FIG. 1 is a perspective view of a roof rack crossbar showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left devotional view thereof the right side view is identical;

FIG. 6 is a top side view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a partial enlarged view of FIG. 1;

FIG. 9 is a partial enlarged view of FIG. 2; and,

FIG. 10 is a partial enlarged view of FIG. 2.

The broken lines in the figures are for the purposes of illustrating portions of the roof rack crossbar, which form no part of the claimed design. 

CLAIM The ornamental design for a roof rack crossbar, as shown and described. 